Molding-machine.



G. E. STEVENS.

MOLDING MACHINE. APPLICATION FILED SEPT. 25. 1912.

Patented Oct. 26, 1915.

2 SHEETS-SHEET I.

r-ge ESteVena Geo G. E. STEVENS.

MOLDING MACHINE. APPLICATION HLED SEPT-25.1912.

1,15?,96?, Patented Oct. 26, 1915.

2 SHEETS-SHEET 2.

Inventor; George Efitevensw COLUMBIA PLANOGRAPH c0.,wAsM|NGToN, u. c.

ATNT GEORGE E. STEVENS, 0F LYNN, MASSACHUSETTS, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK;

MOLDING-MACHINE.

Specification of Letters Patent.

Patented @ct. as, 1215..

Application filed September 25, 1912. Serial No. 722,258.

other metals, and more especially to molding machines of the" rock-over type, in which the flask containing the sand mold and pattern is inverted and the pattern withdrawn from the inverted mold.

The object of my invention is to provide an improved molding machine adapted to operate in connection with'flasks of various sizes, which shall be operated by power means, so that the manual effort ordinarily required to invert the flask andremove the pattern will be avoided, which shall operate to remove the pattern rectilinearly from the mold, and in which all bearings'and movable parts subject to injury from sand or other foreign substance are effectually housed and protected. 1 r i For a more complete understanding of my invention, reference maybe had to the accompanying drawings showing one embodiment of my invention, in which- Figure 1 is a side elevation of the complete machine with a molding flask mounted thereon; Fig. 2 is a top plan view of the same; Fig. 3 is a left hand elevation of the actuating means; Fig. 4: is an enlarged horizontal section on l1ne '4 4; ofFlgl; Fig. 5 is an axial sectlon ofthe actuating means,

and Fig. 6 is a detailed sectional view on a larger scale of the lower portion shown in Fig. 5.

A rectangular truck frame 1 is provided with axles 2 at its ends, on which are wheels 3 to enable the machine to be readily moved about. At the left end of the truckframe 1 are guide boxes 4 arranged vertically for the reception of T-shaped posts--5jwhich serve as a delivery stand felt the inverted flask 6 and are provided with series oftrans verse apertures 7-, in which pins or bolts 8 may be insertedthrough the guide boxes l to hold-the T-shaped posts 5 in adjusted elevation to accommodate flasks of different depths. At'the center of the truck frame 1 is secured by means 'of bolts 9 a=flanged end to by the fulcrum'pins 30.

10 of guide post or cylinder 11 within which is arranged an elevator plunger 12.

The plunger 12 has a transversed T- shaped head 13, in which are formed bearings for a shaft 14 which constitute the hinge of the rock-over mold table, and extendingupwardly and to the left from the ends of the head 13 are stop arms 16, for a purpose to be referred to later.

The rock-over mold table consists of two levers 15of the third order fixed to the ends of shaft 1 1 and having their long arms 17 bent at an angle and the free ends provided with a suitable platform 18 and clamping devices 18 forsecuring a complete mold thereto during the rockover movement. Posts 19 are extended up from the right end of the truck frame to support the free ends of the'levers 15 when in the full line position shown in Fig. lgthe position in which the pattern board 29 and flask 6 are supported during the filling and ramming up of the sand of the mold. The short arms 20 of the levers 15 are connected through lost motion devices in the form of extensible or telescopic links21 to stationary pivots 22 on the flange of the elevator cylinder 11. The telescopic'links 21 comprise lower members 23 made hollow and rectangular, asindicated in Fig. 1, with elongated slots 24- in the sides thereof, and upper members 25 in the form of flat bars fitting loosely within the lower members 23, and having near their lower endstransverse pins 26 adapted to play back and forth in the slots and determine the extent of separation. of the members of the links. Theupper ends of the telescopic links 21 arebifurcated for the reception of the ends'of the short arms 20 ofthe rock-over levers, and connected there- These upper ends are adapted to abutagainst the under sides of the stop arms 16, as shown in Figs.

1, 3 and-5, so as topositively arrest therockvlong arms of levers 15 have on their inner sides stop projections 27 adapted to engage the upper sides of the stop arms 16 when the rock-over levershave been invertechso as to malntaln them in a horizontal position as shown by the dotted lines 1n F1g. 1.

Upon completion of mold, bottom board 28 is placed at thetop of the flask 6, and the clamping devices 18 set up. Then upon applying power to move the elevator plunger 12 upwardly, the rock-over table is first moved directly upward until the cross pins26 of the telescopic links engage the upper ends of the slots 24 and prevent further separation of the members of the links,

and as the elevator plunger is caused to move higher, the rock-over arms are forced to rotate' upon their hinge, shaft 14, until the 'pivotal'points 22 and are brought into alinement with the axis of'shaft 14, at which time the rock-over table with the flask is in substantially vertical position with the centerof gravity thereof on the opposite side of theivertical plane of theshaft 14, and upon allowing the elevator plunger to descend, the rock-over table moves overto the upper dot-and-dash line position of Fig. 1 where the levers are arrested in horizontal position by the stops 27 engaging the stop arms 16, the fulcrums 30 meanwhile having vator plunger 1.2 to the upper dot-and-dash line position in Fig. 1, at which point the i pattern will be completely removed from the mold and without displacement of any sand of the mold and then rocked over into the starting position. p I

The means for actuating the elevator plunger 12 consists of a jack screw device 31 in the form of a'screw rod, having a steep pitch, preferably a triple thread, engaging a bushing nut 32 fixed to a head 33 near the lower end of the plunger. The screw 31-is rotated by means of a friction clutch member *34 engaging a second clutch member 35 which is provided with a peripheral worm wheel 36, meshing with a-worm 37 mounted on a shaft 38 of an electric motor 39 or other power device journaled in one side of the cylinder 11. The clutch member 34 hasa peripheralgroove 40 in its hub for the reception of stud pins or rollers 41 carried by a yoke42 fixed upon a rocking shaft. 43

I which extends to one side of the machine "and is-provided at its outer end with a hand lever 44- by means of which the engagement of the 'clutch' members may be manually 7 controlled.

Theclutch member 34 has a-transverse pin i 45 extending through the hub thereof and i through a transverse oblong slot 46 in the fscrew rod- 31, whereby theclutch member may be moved longitudinally of the screw rod, but held against relative rotary movement thereon (see Fig. (3). In order to yieldingly force the clutch member 34 upwardly out of engagement with the other clutch member 35, a spring 47 is arranged in a bore in the lower end of the screw rod 31 and exerts its force upon the pin 45 carried by the upper clutch member through a guide plug 48. The lower end of the spring rests against a set screw 49 threaded into the lower end of the bore of the screw rod 31. The end thrust of the screw rod is received by a roller step bearing 50 between the head of the set screw 49 and the inner side of the cup-shaped head 51 of the elevator cylinder 11. The lower clutch member is journaled in a bushed plate 52 in the lower end of the cylinder 11 and secured by a set screw 53, and in order to prevent the screw rod 31 from drawing upwardly a nut 54 is threaded upon the lower end thereof and engages a larger washer 55 located between the nut and the lower surface of the plate 52. The lower end of the cylinder 11 is adapted to be flooded with oil, as indicated in Fig. 1, so that all the parts in frictional engagement may be constantly lubricated, and in order that sand and other foreign substance may be positively excluded, the upper end of the plunger 12 has a peripheral flange 56 to which a sheet metal cylinder or casing 57 is attached and extends down over the greater portion of the cylinder 11.

In the described arrangement, it will be seen that with the motor shaft 38 and the worm 37 constantly driven in one direction, it is possible to actuate the jack screw 31 by moving the hand lever 44 to the left (Figs. 1 and 5), until the plunger 12 has been raised to its utmost extent. Then upon movement of the lever 44 in the opposite direction, thejack screw will be more or less freed from the control of the drive clutch member 35 and, by reason of the steep pitch of the screw, will tend to back off under theweight of the plunger 12 and parts carried thereby, but such backing 01f of the screw 31 is definitely controlled through the braking action of the clutch members under the control of the operating lever 44, so that the filled flask may be deposited upon the T-shaped supports 5 without shock or other eifort tending to disturb the packed sand constituting the mold. After the flask has been deposited upon the receiving supports, and the clamping devices 18 disconnected, the elevator plunger is again raised by the power means operating the screw 31 through the controlled clutch means, as the levers 15 of the rock over table are held in definite position by reason of the stops 27 engaging the stop arms 16, the rock-over table and the pattern 29 and pattern board 29 will be elevated in a straight vertical direction to withdraw or part the pattern from the sand. After the mold table has reached the position shown by the upper dotted lines in Fig. 1, with the pattern fully withdrawn from the mold, the table is automatically rocked over by the power means moving the elevator plunger above the position indicated by the upper dot-and-dash lines in Fig. 1, and the action of the telescopic links 21 upon the short arms of the levers 15. After the table has passed the vertical position, it may be allowed to descend to its original position by merely disconnecting the members of the clutch and again allowing the jack screw 31 to back off under the braking action of the controlled clutch.

It will thus be seen that according to my invention, tlie'machine may be actuated by a very simple power means to rock-over the table and the mold carried thereby, and that all operations of the device are controlled with facility by a single lever, so that great care or skill on the part of the foundryman is not required in the operation of the machine.

I do not desire to restrict myself to the particular form or arrangement of parts herein shown and described, since it is apparent that they may be changed and modified without departing from my invention.

Nh at I claim as new and desire to secure by Letters Patent of the United States, is

1. In a rock-over molding machine, the combination of a hinged mold table, an elevator device arranged to vertically raise said table and hinge, power means for actuating said elevator, and manually operated means for controlling the engagement of the power means with said elevator device:

2. In a rock-over molding machine, the combinatlon of a lunged mold table, an elevator device connected to the hinge of said table to raise the latter vertically, power means for actuating said elevator device, and a manually operated friction device for controlling the engagement of said power means with said elevator device.

3. In a rock-over molding machine, the combination of a hinged mold table, a vertically movable plunger connected to the hinge of said table, a screw rod in engagement with said plunger, a power shaft, and a manually controlled friction clutch between said shaft and said screw rod.

at. In a rock-over molding machine, the

combination of a hinged mold table, a vertically movable plunger, a jack screw device of high pitch for moving said plunger, a power device, and a manually actuated friction device for transmitting motion from the power device to said jack screw device to elevate said plunger, and for braking the descent thereof.

5. In a rock-over molding machine, the combination of a vertical guide post, a plunger movable in said post, a rock-over mold table hinged to the upper end of said plunger, a jack screw device for moving said plunger, a power shaft, a friction clutch, a worm on said shaft, a worm gear in mesh therewith and connected to the second member of the clutch, said screw, clutch and gears being located within said post, and a cylindrical casing connected to the upper portion of said plunger and extending downward over the outer walls of said post.

In witness whereof, I have hereunto set my hand this twenty-third day of September, 1912.

GEORGE E. STEVENS. Witnesses:

JOHN A. MGMANUS, J12, FRANK H. JOHNSON.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

